Upgrade scenario

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Current situation:
- 1 central location running SQL 7.0 acting as a publisher and distributor
in merge replication
- 30 remote locations running SQL 6.5 and acting as subscribers
- subscribers are pushing articles to central location twice a day

We are planning to replace all servers with new ones running windows 2003
and SQL 2005.
There is no way we can replace all servers and migrate the databases over
night so we need a scenario where we can replace remote servers one by one
and to ensure that old and new remote locations can replicate with central
location at the same time....
any suggestions??? Thanks

Tom


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