Using XP (or xp) in a Search string returns the following:
To use XP or not to be?The search term you specified (xp) is under the minimum word length (3) and therefore will not be found. Please make this term longer.
If this term contains a wildcard, please make this term more specific.
Unfortunately, you cannot include words shorter than 3 letters. However, you can use some special short words, like 95, 98, Me, and XP.