OAB without Cached mode

Does anyone know if you can have the OAB updating while being in cached mode on exchange 2003 and outlook 2003?  We have been told by MS that the only way to keep the OAB updated is to keep outlook in online mode.  We have sales guys in the field that use cached mode due to not alwasy having a connection.  Putting them in onlne mode 24/7 is not a real option.  the reason behind all this is that the OAB while in cached mode does not pick up updates when new users are added or people are moved between sites.  They told us that the sales guys woudl have to go to online mode every so often to get the updates and that even doing a address book download while in cached mode will not solve the isue.   Does this sound right?  Makes me think that Exchange 2003 lost some functionality over 5.5.  Does anyone have any suggestions??


Thanks for the help.