Migration to OfficeXP?

Like every Update the newest access Version ask the user's to migrate to Access XP when they open an older Database. We do migrate some of ours "easyer" Databse before the first users come, open it and updated it and all are not running the newest XP Version... (that's the horror story) you can make a copy of them and try to migrate the copy and have a look what happens. For more "complicate" Database we do migrate them to our Oracle Database and the Problemes was over... On this "complicated" Database was a migration not possible then some of the 97 coding was under xp not the same, and a reprogramming cost too much (money and time). Be very carefull to test the migrated Database, a good test is nearly the whole job done. For Timeline i'm a little confused but i can't give you one, i just tell you take enough time to test it before, then later is too late, after a migration (good planed or not)you become a long time soo much phone-calls with questions that you don't have times to reprogramming your access Database... wisch naturally good luck for your Migration (sometimes it is needed too).