Here are a few questions about computers I’ve received recently from people like you, and my answers. I have edited and restated the questions a bit, for readability. This week my mailbox contained questions about using the Belkin Easy Transfer cable, moving files from a Mac to a PC and backing up a Mac with Parallels virtual machine software.

Last week, you advised using an Easy Transfer Cable to transfer files from a Windows XP computer to a new Windows Vista computer. But what about those of us still using Windows 98 who want to get a new Vista machine?

The Belkin Easy Transfer cable I discussed only works fully when the old PC is running the latest version of Windows XP, although it will work partially with Windows 2000. But there are other methods for people using older consumer versions of Windows, such as Windows 98 and Windows ME.

You can, of course, use a two-step process, copying your files to recordable CDs or to an external hard disk and then inserting the CDs into the Vista PC, or attaching the hard disk to it and moving the files over. You could also use a USB flash drive in the same manner. Or, if you are skilled at networking, you could move the files over a network.

However, there are also some cable solutions that will work with Windows 98 and Windows ME. For instance, the Tornado, the cable with the built-in manual file-copying software I discussed last week, works with versions of Windows back to the SE edition of Windows 98, though you need to install driver software for that version. More information is at www.thetornado.com.

Another product I reviewed last week, PCMover from LapLink, also works with older versions of Windows, albeit with different cables that LapLink sells, not the Easy Transfer cable. Information is at laplink.com. Another similar product that has worked for me in past tests is IntelliMover by Detto, at detto.com, which also comes with cables.

I am a Macintosh user and plan to buy a new Dell with Windows Vista. How can I move my programs and files from the old Mac to the new Dell?

Well, first of all, you can’t switch your Mac programs to the Dell. They won’t run on Windows. But nearly all of the common files used on a Mac, such as Microsoft Office documents, text files, pictures, songs and Adobe PDF files, will work fine on your Dell.

I don’t know of a simple, integrated cable-and-software solution for such a Mac-to-Windows migration. So you’ll likely have to use recordable CDs, or an external hard disk or USB flash drive. Just make sure to use drives that are formatted for Windows. Macs can read, and write to, such Windows drives, but Windows PCs can’t natively read, or write to, Mac-formatted drives.

I have a Mac running Windows via the Parallels virtual machine software. I am also running an older Windows PC, which I back up to an external disk drive. Can I plug the external drive into the Mac and copy the files into the Parallels environment?

Yes. A virtual Windows computer running on a Mac behaves just like a regular Windows computer, so you can indeed plug in an external hard disk and copy the files over. In addition, as I mentioned last week, the forthcoming new version of Parallels includes a utility called Transporter that will move the entire contents of a Windows PC into a virtual Windows machine running on a Mac. See parallels.com for details.

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Because of the volume of e-mail I receive, I can’t routinely answer individual questions by e-mail, or consult on individual problems or purchasing decisions. I read all questions I receive and select three each week to answer in the column.

• Write to Walter S. Mossberg at mossberg@wsj.com

Here are a few questions about computers I’ve received recently from people like you, and my answers. I have edited and restated the questions a bit, for readability. This week my mailbox contained questions about downloading email to both home and work computers, the differences in Treo models and transferring files between Windows systems.

If you have a question, send it to me at mossberg@wsj.com, and I may select it to be answered here in Mossberg’s Mailbox.

I want to download all my daily emails to both my home and office computers, which are both Dells. I am told that, in order to achieve this, I have to instruct my email program to keep my email on the server. How do I do that?

With most corporate email systems, and with a type of consumer email called “IMAP,” email is synchronized among your computers. But many home users have a type of email called “POP,” which isn’t synchronized.

To get the same email messages on multiple machines, POP users have to instruct the email software on each computer not to delete messages from the remote server when they’re downloaded to one of the PCs. That way, they remain available for downloading onto your other PCs. This is generally accomplished by turning on an option in the settings for your email account, which can be a convoluted process.

In Microsoft Outlook 2003, go to the Tools menu, select Email Accounts, then pick “View or Change Existing E-mail Accounts.” Select the account you want, click Change, then, in the next window, click More Settings. In the next window, select the Advanced tab and click in the checkbox called “Leave a copy of messages on the server.” Then click OK, then Next, and Finish, in the windows that follow. Whew.

In Outlook Express 6, it’s a little easier, but not much. On the Tools menu, select Accounts, then Mail, then the account name you want. Click on Properties, then select the Advanced tab. Check the box next to “Leave a copy of messages on server.” Then click OK, OK and Close.

Both programs allow you to set a number of days for the messages to stay on the server. I recommend setting that to 1 or 2, which is long enough so they’ll be downloaded to all your PCs, but short enough so your mailbox on the server won’t exceed its limits. I also suggest clicking an option that does delete from the server any messages you actually delete on any of your PCs. You’re not likely to want to see those everywhere.

Since the Treo 600 is much cheaper than the newer Treo 650, I am considering getting a 600 instead of a 650. What will I be missing if I do so?

The two models are very similar in their look and feel and their core functionality. The key differences are that the 650 has a much better screen, a removable battery, a slightly better keyboard and a better (but still not great) built-in camera. It also has Bluetooth wireless networking, and it is built much better, because Palm is using a different contractor to assemble the 650 than the one it used for the 600, which was plagued by quality complaints.

I am about to buy a new computer running XP Pro. I want to selectively transfer some, but not all, files from my old Windows 98SE computer over a cable. What is the best program for the job?

I generally recommend IntelliMover by Detto, at www.detto.com. Note, however, that IntelliMover won’t move application programs — only files, like Microsoft Office documents, pictures, songs, etc. If you want to move programs, try Alohabob PC Relocator, at www.alohabob.com.

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Because of the volume of e-mail I receive, I can’t routinely answer individual questions by e-mail, or consult on individual problems or purchasing decisions. I read all questions I receive and select three each week to answer in the column.

Write to Walter S. Mossberg at mossberg@wsj.com

If you have a question, send it to me at mossberg@wsj.com, and I may select it to be answered here in Mossberg’s Mailbox.

What is the fastest and easiest way to transfer files and programs when switching to a new computer? It will be from a Windows PC to a Windows PC and I have stored a lot of music in Musicmatch that I want to transfer over.

The fastest and easiest way is to use a special “migration” program, which transfers files in bulk via a cable that connects the two machines. When I last tested these, the best was Detto’s IntelliMover, which costs $50. More information is at www.detto.com.

However, IntelliMover transfers only data files, including music and settings. It doesn’t move over programs, such as Musicmatch itself. The only program I’ve tested that does that is Alohabob PC Relocator Ultra, by Eisenworld (www.eisenworld.com). It costs $70, and it also transfers files and settings. In addition, it can move over some, though not all, programs.

I am buying a PC with Windows XP. I want to use the Firefox browser, but I have a dial-up connection, so I would like to buy it on a disk. How do I do this?

Mozilla, the parent organization for Firefox, sells the browser on CD from its online store, at store.mozilla.org. However, the online store is currently closed while it is being revamped. So you might have to wait awhile to order your CD. However, the installation file is relatively small, at just 4.6 megabytes, so it might be possible to download it without much pain, even over a dial-up connection.

My 16-year-old son has just built his own PC using the Windows XP operating system. He is about to build another PC for his brother. Can we still use our existing Windows XP operating system for the new PC, considering that the new PC is to be used in the same household?

No. Microsoft licenses Windows XP for only a single computer and requires that it be “activated” over the Internet so that the company can block it from working on additional PCs. It makes no difference if the second PC is in the same household. Apple offers a multiple-computer family plan for its operating system, but Microsoft doesn’t.

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Because of the volume of e-mail I receive, I can’t routinely answer individual questions by e-mail, or consult on individual problems or purchasing decisions. I read all questions I receive and select three each week to answer in the column.

Write to Walter S. Mossberg at mossberg@wsj.com