Migrating SQL Server Published databases with minimal downtime

All,
I have a requirement in which databases in Server A has to be mirated to Server B. Server A has two databases in Merge replication and one with Transactional replication. Server A act as the distributor itself.
My question is how can I migrate all these production databases which are also publishers to new sever B with minimal downtime, and with out breaking replication.
I read that if the Server B is renamed as Server A then replication will continue with out any errors.Please suggest how to migrate the publisher to Server B with minimal downtime.
Also I would like to know if the replication is Server A->Server C->Server D, then if I can migrate Server A to Server B with out dropping replication, will it affect the replication setup from Server C to Server D. Does it cause any replication errors.
Thanks in advance!

Just to throw some thoughts out there.
It sounds like the "blocker" in the overall migration strategy is the Distribution database and the fact that it is local to a Publisher.
Once you have migrated the Distributor, the remainder of the problem
is more straightforward, using solutions such as Database Mirroring to failover to a new server with minimal downtime for example.
If I were performing this migration project, I would agree with the business that there was to be a
short replication service interruption whilst we migrated to a new Distribution database/server. I would also apply Hillary's recommendation to use the opportunity to split-out the Distribution database to a dedicated server.
Using this approach, you could build and configure the new Distribution database before the migration "cut over" phase. The cut-over would require that you Drop the replication topology and re-create it, using the new Distributor DB/Server. You can script
ALL the steps required for this ahead of time, resulting in the actual cut-over to the new Distributor being completed in a couple of minutes max (the database involved are already in Synch).
Once done, you can proceed ahead with the remainder of the migration.
Overall this is not a trivial project you have on your hands and in my opinion you absolutely must perform the process in a test environment before attempting to do so in Production.
Good luck.
John Sansom | SQL Server MCM
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SQL Consulting

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