Max number of attributes in entry

[Patric <patricrt@gmail.com>]

Hi all,

I am attempting to add an entry to my directory with a large number of 
mail attributes.
This works fine until I have more than 51 mail attributes. Any more than 
that and the add fails with the following:

Error 80 - Unknown error

What I find strange is that if I add the entry with up to 51 mail 
attributes, I can then go and add individual mail attributes to the 
existing entry.
If I attempt to delete the entry when it has more than 51 mail 
attributes I get the same error:

Error 80 - Unknown error

But if I remove individual mail attributes until there are only 51 then 
I am able to remove the entire entry.

Is there some limitation that I am not aware of, and could any body 
suggest a method for me to get around this?
Any advice would be much appreciated!

Regards,
Patric