Some emails are stuck in the mail.box and if you try to re-save them you got the error message "Can't change document's UNID". The solution to fix that is quite simple.

If you run a security scan (e.g. Nessus) against a Domino HTTP / SMTP Server you might get the following result:

Hostname: "Domino1" (xxx.xxx.xxx.xxx)
Plugin name: "SSL/TLS Protocol Initialization Vector Implementation Information Disclosure Vulnerability"
Severity: Medium
Risk factor: Medium

Fixing this "issue" is quite easy:

BM Lotus announces the release of Notes/Domino 8.5.3 Fix Pack 3, a scheduled Fix Pack of a limited number of low-risk, high-impact fixes to help customers safely avoid known issues.

Sometimes it is necessary to get the OS from the user via Lotus Script. This can be done very easily:

I recently migrated a customer from Notes 8.5 to 8.5.3. The customer was a small shop so there backup solution was also very small. To help him to save some backup space I moved the "fulltext index" to another folder, which is excluded by the Backup software. This can be easily implemented.