Lotus Notes is more careful, offering selective replication where the user sets up profiles. In addition, since Notes can hold documents and not just messages, large items can be truncated automatically. This causes a nother scaling problem. The fear with personal replication is that too many people will suddenly choose to replicate everything, particularly when it's up to each user to decide. Servers and networks supporting personal replication of shared data will have to be carefully architected.
Notes can balk when the number of replicants gets large.
Notes has shown that the functionality is possible, even if the practical problems due to the volume of replication are troublesome. To Get Personal Collective yet very structured data means new resynchronization problems. At least with my own e-mail or Word documents I can personally decide which one is the one to keep. With corporate data, the person doing the replication may not be able to make these decisions. Third-party solutions can help solve certain problems for the disconnected user and the corporation.