Apple and Adobe have a long history of conflict, dating back to the early days of the Macintosh. Steve Jobs, Apple's co-founder, was a strong believer in closed platforms, while Adobe was a leader in the development of open standards. This fundamental difference in philosophy has led to a number of disputes between the two companies over the years.

Here are some of the key reasons why Apple and Adobe have difficulty getting along:

1. Different business models: Apple is a hardware company that sells its own operating system and software. Adobe is a software company that develops and sells software for a variety of platforms. This difference in business models creates a natural tension between the two companies. Apple wants to control the entire user experience, while Adobe wants to ensure that its software is compatible with as many platforms as possible.

2. Competing products: Apple and Adobe both offer a number of competing products. For example, Apple's iWork suite of productivity software competes with Adobe's Creative Suite. This competition has led to a number of disputes between the two companies over pricing, features, and marketing.

3. Philosophical differences: Steve Jobs was a strong believer in closed platforms, while Adobe is a leader in the development of open standards. This fundamental difference in philosophy has led to a number of disputes between the two companies over the years. Apple has been accused of being anti-competitive, while Adobe has been accused of being too open.

4. Personal rivalries: The conflict between Apple and Adobe has also been fueled by personal rivalries between Steve Jobs and Adobe CEO Shantanu Narayen. Jobs was known for his abrasive personality, and he often clashed with Narayen. This personal rivalry has made it more difficult for the two companies to resolve their differences.

5. Lack of trust: The history of conflict between Apple and Adobe has created a lack of trust between the two companies. This makes it difficult for them to work together effectively, even when they have a common goal.

In recent years, there have been some signs that Apple and Adobe are trying to improve their relationship. In 2010, the two companies announced a partnership to develop new technologies for the publishing industry. However, it remains to be seen whether this partnership will be successful in overcoming the many challenges that stand in the way of a lasting peace between Apple and Adobe.