By default, Windows XP requires that passwords on your Samba server:

While passwords have length restrictions, a specific maximum of 32 characters is not a universal default requirement that would cause connectivity issues with Samba, nor is it the most critical default for XP connections.

Password complexity requirements (numbers and letters) are usually policy-driven, not a default requirement imposed by Windows XP for basic Samba connectivity.

By default, Windows XP (and later Windows versions) requires passwords to be encrypted during SMB/CIFS authentication; Samba servers must be configured to support encrypted passwords to allow these clients to connect successfully.

Password expiration policies are usually set at the domain or local user level and are not a default requirement for a Windows XP client to connect to a Samba share.