Lotus Organizer 5.01 Address Book problem

I am using 907 pages of the Address Book in my 5.01 version of Lotus Organizer. Quite suddenly I lost half of the index, I now only have A to L. At the bottom of each page, from 1 up to 907 it states that it is, for example "page 5 of 143,165,664.
My question is how do I get rid of the 143 million 164 Thousand and 757 pages that I am not using? Then perhaps the index will return.
Any help will be appreciated.
John