Allocate Space error in Lotus Notes

The error indicates that the NSF Files used by Lotus Notes is corrupted or might be damaged.

There might be several reasons related to this problem:
It may be due to problem through Domino Server.
Might be Virus Attack
Sudden shut down of the application.

You can use a third party software “SysTools Export Notes” to convert NSF to PST file and use the respective file in Outlook.

You can also try to resole this issue using Fix up Command Line Tool.
use Fixup-i-mail/xxx.nsf
This will discover all the files in databse
run compact i-c-d-k a compact tool
load the compact-c-i mail/xxx.nsf
Run updall-R
You can use this file in another system.