Published technote from Lotus knowledgebase. (There are actually good stuff in there, try it)
The installation of a Sametime 2.5 server fails with the following error, attempting to install on top of a Domino 5.0.10 server:
"This Sametime release requires a minimum of Domino release 5.0.7a. Please upgrade your server before installing Sametime"
To reproduce this issue:
1. Uninstall the Sametime and Domino servers if they are installed (folders, registry, etc.)
2. Download the full installation files, or obtain a Sametime 2.5 CD.
3. Run the Domino 5.0.10 installation and complete the Domino setup.
4. Using the Sametime installation files, install the Sametime 2.5 server.
You will be prompted to enter the name and company to which the product is registered, installation directory and the type of installation (core or complete). After this point the error message above occurs.
Solution:
This issue has been reported to Lotus Software Quality Engineering. The issue occurs because the install program is comparing whether 5.0.10 is greater than 5.0.7a. It sees 10 as less than 7a because the "1" in "10" is less than the "7" in "7a" (whereas 9 would be seen as greater than 7, so this issue does not occur with the 5.0.9 installation).
It is possible to fool the Sametime 2.5 installation into thinking the version of Domino is something other than 5.0.10, by doing the following:
Install Domino 5.0.10.
Make sure Domino runs correctly.
Stop Domino.
Backup nstrings.dll (usually found in c:\lotus\domino directory) to a safe location.
Copy nstrings.dll from a Domino 5.0.9a install to the 5.0.10 installation.
Install Sametime 2.5.
[IMPORTANT] Before the server reboots, replace nstrings.dll with the correct 5.0.10 version.
Reboot and the Sametime setup should run smoothly.
Note: Do not run Domino or Sametime with an old nstrings.dll in place. This can be dangerous because the 5.0.9a version of nstrings.dll may not be compatible with the later versions of Domino.