The paragraph missing from the question is the following:
The IT department is in the process of overhauling our website. This update will require the implementation of a separate server for our company intranet and e-mail. This conversion will require a 24-hour downtime. As a result, all intranet and e-mail services will be unavailable on Saturday.
Answer:
To inform the reader that the company intranet and e-mail services will be unavailable on Saturday.
Explanation:
The author explains what the IT department will do and how long its activities will be only to inform why the company intranet and e-mail services will be unavailable. The major purpose of the paragraph is to inform the reader that the company intranet and e-mail services will be unavailable on Saturday. The whole text revolves around that point because if we were to remove the non-essential information of the text, everything would be removed except for the part that informs that such services will be unavailable on Saturday.