Microsoft does not recommend using Office application in server-side scenarios. There are great 3rd party .NET excel component in the market that do the same job (or even better).
From a comparison testing I performed about a year ago Spire.XLS for .NET is the best from the following perspectives:
1. Read/Write of excel.
2. Support of embedding images.
3. Size of result Excel file is very small.
4. Convenient API and very similar to Office's one.
5. Multi-threaded and multi-process support.

Boris Modylevsky Developer2009-06-19

The best excel component for .net, thanks for e-iceblue Ltd, no doubt for us to choose nice solution.

Paul Menheere Developer2009-01-09

If you search great products, with great support, don't search more. You are here at the right place. Spire.XLS are simply powerfull...

Alain Falanga Developer2008-03-09

Many Thanks for this component.

Surg Bartol Developer2007-08-02

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