Win 2000 upgrade

One PDC, two BDC, five member servers. Exchange 5.5 and IIS 4.0 run on BDC. MS_SQL 6.5 runs on member server(Planned upgrade to 7.0 within weeks). IIS runs on another member
server in DMZ.

If I upgrade from NT 4.0 to WIN2000, will Exchange server 5.5, IIS 4.00 and SQL 7.00
able to run on WIN2000. If any compatible isue exists, what is the best solution?

Any idea will help.

Thanks