Well, the first question is: Were you an MD? You bid your vacation based on the category you are in when the vacation bids close. MD's keep their vacations from their previous category. If you are any thing else (AE/VD) you will have to rebid vacation when converted.

If you are converted on 31jan2012, depending on how many weeks vacation you have, you will bid them in January (unless you have more than 2 weeks). The relevant section of the contract is section 7. Here is part of it:

7. A pilot who:
a. converts into another category pursuant to:
1) an advance entitlement or voluntary displacement:
a) will be notified via DBMS to re-bid his unused vacation period(s) through the vacation move-up process.
b) will change any previously awarded and unused vacation period(s) through the vacation move-up process.
c) may be assigned an available vacation period, in inverse seniority order, if he does not change his previously awarded and unused vacation period(s) through the vacation move-up process.
2) a mandatory displacement, may retain his previously awarded unused vacation period(s).

Denny