Portal Site for Company Technicians

We are currently using this Portal for our Technicians:

[url removed, login to view]

Having used this on another site I noticed that it got slower and slower as the site grew. I believe that this was due to the fact that it did not use a database but text files for storage.

We have been using this for nearly 2 years with good results but woould like to see something new in php with the following features:

Individual Accounts

Instant Messenger with ability to save messages

Web Based email

Message Board

Knowledge Base

Searchable

Personal Menu and Favorites

Client Database

Document Upload/Download

Newsletter Subscription

Admin account with control over all accounts

There are cm's out there that are very close to what we are looking for but they all seem to be missing one or more features.

Beceriler: PHP

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Proje NO: #5811