Douglas J. Steele said:
Nope. In fact, that's a recommended approach when upgrading is a gradual
process. Split the application into a front-end (containing the queries,
forms, reports, macros and modules), linked to a back-end (containing the
tables and relationships). Convert the front-end to the new version of
Access, and distribute it to those users for whom it's appropriate. Have
all users link to the same back-end, in the "original" version of Access.
Once everyone's converted, you can convert the back-end.
(NOTE: Any changes to the front-end should always be made in the oldest
version, and then converted to the newer version(s).)