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They are often installed without explicit approval. COM add-ins are a special type of add-in written in machine language. The number one thing you can do: If you have any COM add-ins installed, un-install them unless they are absolutely required. We have tried to order the steps from easy to do to hard to do. Memory problems are often difficult to solve.
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It is also possible that none of these steps will solve. The following are steps one can take that may solve memory problems. We have had all of our add-ins open at one time and no memory issues. VBA add-ins (the kind we write) are not compiled and are called Excel add-ins and do not cause memory issues.Ususally you can run one COM add-in without issues. Often at the expense of Excel, especially if they are badly written.