The official site supplies a table[2] that matches each phone model with the most recent compatible version.

[5] The backup feature in PC Suite uses a non-documented binary file format (.nbu), which can only be used to restore to a phone through the proprietary client.

Third-party programs (either commercial or free) can be used to read the file, but they greatly vary in the amount of information they can retrieve.

Nokia PC Sync allows the user to synchronize contacts, calendar, notes, to-do items, e-mails, bookmarks and files/folders between a supported Nokia mobile phone and: PC Sync 7.0.9.2 contained a major bug, truncating street addresses which have been edited on the PC to run over more than one line, when synchronized back to the phone.

It was possible to lose large parts of user's contacts' address information due to this issue.