Microsoft may be preparing to announce a new round of layoffs as early as tomorrow, according to TechFlash, which cited knowledgeable unnamed sources.

The exact number of the cuts isn’t known, though it could be relatively small compared to the thousands of layoffs last year.

The move appears to be another attempt to keep a lid on expenses despite the easing of the recession. But the core business is actually pretty strong. Windows 7 has taken off in the PC market, and overall PC unit sales are expected to grow 20 percent this year.

TechFlash says the cuts aren’t unusual for Microsoft at the beginning of a new fiscal year. Micrsooft has yet to offer any comment to us, but it declined to comment to TechFlash.

Microsoft had 88,596 people at the end of June. That was up slightly from 88,180 worldwide at the end of March, and down from 91,743 at the end of July last year. Contractors aren’t included. Microsoft reports earnings on July 22.