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Mark it as T minus four weeks and counting.

We follow up on last week's inaugural FAQ with more questions and answers, including clarifications on inventory and news of one online retailer dropping XP's price by more than 10%. Must retailers stop selling XP after midnight of June 30?

No, says Microsoft. Although it's calling June 30 the retail and OEM availability end-date, the demarcation between selling and not-selling won't be razor sharp, the company said last week.

"The exact cut-off day for selling Windows XP is determined by OEMs and retailers, who can keep selling standalone versions as well as PCs with Windows XP preloaded by OEMs distributed prior to June 30, 2008, as long as their supplies last [emphasis in original]," a Microsoft spokeswoman said last week in an e-mail.

In other words, unless a retailer has pared its XP inventory to the bone, expect to see copies still selling into July, perhaps longer. Likewise for already-built machines that have XP installed, since dealers won't be required to yank them off shelves on July 1, but can clear their inventories at their own pace. If system builders can continue to sell PCs pre-loaded with XP until Jan. 31, 2009, does that mean I'll be able to buy the OEM edition of Windows XP at retail or online until then?

No. And we can see the confused look on your face from here.

The retail version of XP Home or XP Professional dubbed "OEM" is also often called the "system builder" edition, in that it uses the same EULA (end user licensing agreement) as the OEM licenses that large computer makers and smaller shops install on the PCs they build and sell.

Retail OEM versions of Windows XP are considerably cheaper than either upgrade or full license versions of the same version; Windows XP Home in OEM costs just US$79.99 on Newegg.com, for example, while the upgrade version runs $99.99 and the full license is priced at $191.49.

OEM versions are cheaper because they don't include free tech support from Microsoft, and legally you're not allowed to transfer the OS from one PC to another, say from an old, creaky piece of junk to something more up-to-date.

But even though "system builders" -- companies or individuals who have registered as a Microsoft Partner and then acquire Windows licenses through one of Microsoft's authorized distributors -- can get their hands on XP through Jan. 31, 2009, you won't be able to get the exact same license via retail once sellers exhaust their supplies after June 30.

"The June 30, 2008 deadline applies to OEMs and retailers for all versions of Windows XP," a Microsoft spokeswoman confirmed last week when asked for clarification.

Clear? Yeah, we thought so, too.